/* * Mach Operating System * Copyright (c) 1991,1990,1989 Carnegie Mellon University * All Rights Reserved. * * Permission to use, copy, modify and distribute this software and its * documentation is hereby granted, provided that both the copyright * notice and this permission notice appear in all copies of the * software, derivative works or modified versions, and any portions * thereof, and that both notices appear in supporting documentation. * * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. * * Carnegie Mellon requests users of this software to return to * * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU * School of Computer Science * Carnegie Mellon University * Pittsburgh PA 15213-3890 * * any improvements or extensions that they make and grant Carnegie Mellon * the rights to redistribute these changes. */ /* * File: machine/thread.h * * This file contains the structure definitions for the thread * state as applied to I386 processors. */ #ifndef _I386_THREAD_H_ #define _I386_THREAD_H_ #include #include #include #include #include #include "gdt.h" /* * i386_saved_state: * * This structure corresponds to the state of user registers * as saved upon kernel entry. It lives in the pcb. * It is also pushed onto the stack for exceptions in the kernel. */ struct i386_saved_state { #if !defined(__x86_64__) || defined(USER32) unsigned long gs; unsigned long fs; unsigned long es; unsigned long ds; #endif #ifdef __x86_64__ unsigned long r15; unsigned long r14; unsigned long r13; unsigned long r12; unsigned long r11; unsigned long r10; unsigned long r9; unsigned long r8; #endif unsigned long edi; unsigned long esi; unsigned long ebp; unsigned long cr2; /* kernel esp stored by pusha - we save cr2 here later */ unsigned long ebx; unsigned long edx; unsigned long ecx; unsigned long eax; unsigned long trapno; unsigned long err; unsigned long eip; unsigned long cs; unsigned long efl; unsigned long uesp; unsigned long ss; #if !defined(__x86_64__) || defined(USER32) struct v86_segs { unsigned long v86_es; /* virtual 8086 segment registers */ unsigned long v86_ds; unsigned long v86_fs; unsigned long v86_gs; } v86_segs; #endif }; /* * i386_exception_link: * * This structure lives at the high end of the kernel stack. * It points to the current thread`s user registers. */ struct i386_exception_link { struct i386_saved_state *saved_state; }; /* * i386_kernel_state: * * This structure corresponds to the state of kernel registers * as saved in a context-switch. It lives at the base of the stack. */ struct i386_kernel_state { long k_ebx; /* kernel context */ long k_esp; long k_ebp; #ifdef __i386__ long k_edi; long k_esi; #endif long k_eip; #ifdef __x86_64__ long k_r12; long k_r13; long k_r14; long k_r15; #endif }; /* * Save area for user floating-point state. * Allocated only when necessary. */ struct i386_fpsave_state { boolean_t fp_valid; union { struct { struct i386_fp_save fp_save_state; struct i386_fp_regs fp_regs; }; struct i386_xfp_save xfp_save_state; }; }; #if !defined(__x86_64__) || defined(USER32) /* * v86_assist_state: * * This structure provides data to simulate 8086 mode * interrupts. It lives in the pcb. */ struct v86_assist_state { vm_offset_t int_table; unsigned short int_count; unsigned short flags; /* 8086 flag bits */ }; #define V86_IF_PENDING 0x8000 /* unused bit */ #endif #if defined(__x86_64__) && !defined(USER32) struct i386_segment_base_state { unsigned long fsbase; unsigned long gsbase; }; #endif /* * i386_interrupt_state: * * This structure describes the set of registers that must * be pushed on the current ring-0 stack by an interrupt before * we can switch to the interrupt stack. */ struct i386_interrupt_state { #if !defined(__x86_64__) || defined(USER32) long gs; long fs; long es; long ds; #endif #ifdef __x86_64__ long r11; long r10; long r9; long r8; long rdi; long rsi; #endif long edx; long ecx; long eax; long eip; long cs; long efl; }; /* * i386_machine_state: * * This structure corresponds to special machine state. * It lives in the pcb. It is not saved by default. */ struct i386_machine_state { struct user_ldt * ldt; struct i386_fpsave_state *ifps; #if !defined(__x86_64__) || defined(USER32) struct v86_assist_state v86s; #endif struct real_descriptor user_gdt[USER_GDT_SLOTS]; struct i386_debug_state ids; #if defined(__x86_64__) && !defined(USER32) struct i386_segment_base_state sbs; #endif }; typedef struct pcb { /* START of the exception stack. * NOTE: this area is used as exception stack when switching * CPL, and it MUST be big enough to save the thread state and * switch to a proper stack area, even considering recursive * exceptions, otherwise it could corrupt nearby memory */ struct i386_interrupt_state iis[2]; /* interrupt and NMI */ #ifdef __x86_64__ unsigned long pad; /* ensure exception stack is aligned to 16 */ #endif struct i386_saved_state iss; /* END of exception stack*/ struct i386_machine_state ims; decl_simple_lock_data(, lock) unsigned short init_control; /* Initial FPU control to set */ #ifdef LINUX_DEV void *data; #endif /* LINUX_DEV */ } *pcb_t; /* * On the kernel stack is: * stack: ... * struct i386_exception_link * struct i386_kernel_state * stack+KERNEL_STACK_SIZE */ #define STACK_IKS(stack) \ ((struct i386_kernel_state *)((stack) + KERNEL_STACK_SIZE) - 1) #define STACK_IEL(stack) \ ((struct i386_exception_link *)STACK_IKS(stack) - 1) #ifdef __x86_64__ #define KERNEL_STACK_ALIGN 16 #else #define KERNEL_STACK_ALIGN 4 #endif #if defined(__x86_64__) && !defined(USER32) /* Follow System V AMD64 ABI guidelines. */ #define USER_STACK_ALIGN 16 #else #define USER_STACK_ALIGN 4 #endif #define USER_REGS(thread) (&(thread)->pcb->iss) #define syscall_emulation_sync(task) /* do nothing */ /* #include_next "thread.h" */ #endif /* _I386_THREAD_H_ */